“Proteins(also known as polypeptides) are organic compounds made of amino acids arranged in a linear chain and folded into a globular form. The amino acids in a polymer are joined together by the peptide bonds between the carboxyl and amino groups of adjacent amino acid residues. The sequence of amino acids in a protein is defined by the sequence of a gene, which is encoded in the genetic code.  In general, the genetic code specifies 20 standard amino acids; however, in certain organisms the genetic code can include selenocysteine—and in certain archaea—pyrrolysine. Shortly after or even during synthesis, the residues in a protein are often chemically modified by post-translational modification, which alters the physical and chemical properties, folding, stability, activity, and ultimately, the function of the proteins. Proteins can also work together to achieve a particular function, and they often associate to form stable complexes.”
(Wikipedia, Proteins, 12/14/2010)

(J. Kimball, Proteins, 12/14/2010)

“Peptides(from the Greek πεπτός, "digested" from πέσσειν "to digest") are short polymers of amino acids linked by peptide bonds. They have the same chemical structure as proteins, but are shorter in length. The shortest peptides are dipeptides, consisting of two amino acids joined by a single peptide bond. Peptides have an amino end and a carboxyl end.”
(Wikipedia, Peptides, 12/14/2010)

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